PHP | Flip an integer or a boolean to its opposite value

index.php

<?php

function flip(int|bool $val): int|bool
{
    $output = $val ^ 1;

    settype($output, gettype($val));

    return $output;
}

// Usage:
echo flip(0) . PHP_EOL; // 1
echo flip(1) . PHP_EOL; // 0
echo (flip(true) ? 'true' : 'false') . PHP_EOL; // false
echo (flip(false) ? 'true' : 'false') . PHP_EOL; // true